Study On Mechanical Characteristic Of Geotechnical Engineering Anchorage

The anchorage in rock and soil is a technology which strengthen structure , rock and soil. Anchor bar strengthen rock or soil tightly by pull force which is provide by the shear strength between anchor bars and rock or soil. Anchor technology has more obvious advantage than traditional method which strengthen rock and soil by the strength and gravity of rock or soil ownself.The mechanism of the force transfering in fixed segment of anchor bar and the capability of shear-resist of anchored joint are pivotal problem. The present design specification and technical standard assume the uniformly distribution of shear stress, but this design assumption does not correspond with the actual working status of anchor bar. Many domestic and abroadhave done much research on the mechanism of the force transfering in fixed segment of anchor bar. The results of their research show that the shear stress distribution is correlative with the behavior of rock and soil and the pull force of anchor bar. In the same rock or soil, when load is relatively low, the maximum of shear stress is at the top of fixed segment of anchor bar, and the shear stress gradually increase and excesses the shear strength of the interface between stell bar and grout or between rock or soil and anchor with the load increasing . thus, the anchor bar gradually slides till anchor bar is pulled out. The existing theoretical analyses haven't refelcted this true mechanism of the force transfering in fixed segment of anchor bar.For the sake of studying the working course from elastic to elastoplasticity slide better, this paper put forward shear stress-displacement curve, and solve the internal force distribution along anchor bar by the basic equntion. At the same time, this paper analysize the difference of columniform fixed segment and the segmeng with anchor slab at the foot of anchor bar.Many study in theory and experment about the capability of shear-reist of anchored jiont have been done, but many study in theory didn't consider the influence of shear dilatatility of joints and has some problem when utlizing the Mises yield criterion, In addition, there isn't accordant opinion about the optimum shear-resist installed angle at present. This paper solved the optimum installed angle anchor bar in anchored joint by considering the shear dilatatility of joint and utlizing the Mises yield criterion. At the same time, this paper analysize the effect of mechanism of distortion of slope, the destoryed-type of slpoe, the manner of reinforcing slpoe and the charge of constructionon installed angle of anchor bar.